W-E402 Series Averaging Axial Extensometers are ideally suited for testing a wide range of materials, including advanced composites. Two independent strain sensors measure axial displacements from opposite sides of the specimen and produce a single averaged output.
Principle of Operation
The signals from two axial sensors are averaged to provide a single output for axial strain, which minimizes errors due to specimen bending.
Generally, it provides more reliable strain measurement especially at small strains such as those used for modulus determination.
The extensometers use a unique design feature, whereby the knife edges remain parallel during displacement. The parallel multiple-flexure design makes these units very durable and they may be left on the specimen past failure.
The extensometers are easy to mount and feature integral springs that hold the unit securely on the